Why is the woman surprised?

admin2011-03-05  32

问题 Why is the woman surprised?
  
W What are you doing sitting in the dark? Why don’t you turn on the light?
M I had it on, but it just turned off a few minutes ago. I figured the electricity had gone out in the building. W No, these lights go off in half an hour if they detect no movement in the room. To turn them back on, all you have to do is wave your arms.
M You’re kidding! I didn’t even budge when the lights went out. I suppose if I had gotten up, I would have figured out what was going on.

选项 A、The building closes at 7:00 p.m.
B、The lights go out automatically.
C、The heat is turned off for the night.
D、The security guards lock all the doors.

答案B

解析
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